Wiring a digital tach
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#8
Sequentially broken
![](https://www.rx7club.com/images/misc/10_year_icon.png)
Unless your original tach is wired up, most likely we'll be unable to help as this information is very swap specific. It would depend upon your year/engine, EMS, ignition setup/etc. All of this could be different given the swap done and we'd have no realistic way of knowing how it was done. If it's a straight swap using an original harness/ECU combination that matches the engine it'd be easier to track down a forum for a car the engine originated from and look on there. Typically you can just pull in signal from the coil triggers, or often from the ECU itself and be fine.
#12
Sequentially broken
![](https://www.rx7club.com/images/misc/10_year_icon.png)
It's the age old 'Do you have that one movie with that one guy who did that thing last summer?' Not very effective to leave out the details.
In any event, you want the yellow/blue wire, which can be either sourced behind the cluster, or also at the trailing coil's original location. (right behind the drivers strut tower)
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